Problem installing applications on Windows 2003 Server Standard

I have done a new installation of Windows 2003 Server Standard on a DL380 G3.
All the servicepacks and patches are installed, also Exchange is installed.

Norton Antivirus Corporate edition is installed and some applications.

From one moment to the other I can't install any applications any more.
Installing an application results in different error's. One application behaves exactly as the post on this page: http://nxt.accurender.com/forums/t/50.aspx (see sreenshots halfway the page).

The application I'm trying to install, I can easliy install it on an other server with no problems.

An other application I try to install installs, but not completely, there are files missing. Again this application works perfectly on an other server.

Also strange: I can't use Windows Update anymore ? It just keeps searching for updates for ever.

I searched alot on Google and finally I reinstalled the Windows Installer with the newest version, but with no luck.

There aren't any specific messages in the event viewer.

After I try to install an application, the process msiexec.exe just keeps alive in the task manager.

Just to be sure, I uninstalled Norton from the server, but it didn't make a difference.

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